Add test for Emitter::sampling_weight()

src/render/tests/test_emitter.py

@@ -0,0 +1,30 @@
+import pytest
+import drjit as dr
+import mitsuba as mi
+
+
+def test01_sampling_weight_getter(variants_vec_rgb):
+    emitter0 = mi.load_dict({
+        'type': 'constant',
+        'sampling_weight': 0.1
+    })
+    emitter1 = mi.load_dict({
+        'type': 'constant',
+        'sampling_weight': 0.3
+    })
+
+    emitter0_ptr = mi.EmitterPtr(emitter0)
+    emitter1_ptr = mi.EmitterPtr(emitter1)
+
+    emitters = dr.select(mi.Bool([True, False, False]), emitter0_ptr, emitter1_ptr)
+
+    weight = emitters.sampling_weight()
+    assert dr.allclose(weight, [0.1, 0.3, 0.3])
+
+    params = mi.traverse(emitter1)
+    params['sampling_weight'] = 0.7
+    params.update()
+
+    weight = emitters.sampling_weight()
+    assert dr.allclose(weight, [0.1, 0.7, 0.7])
+